Types of Face Masks 1/2/3-ply normal non-woven facemask It is made of a breathable fabric with efficient filtration, and minimized particle generation, free of silicone oil or odor 4-ply carbon facemask. The 4-ply active carbon facemask is composed of PP non-woven cloth on the top and bottom layers. The middle two layers are active carbon filtration material and melt-blown non woven cloth. This kind of facemask is odorless, can filtrate bacteria, dust, micro granules, and organic poisonous gases effectivelyCleanroom facemask. It is made of ES material, with the PU head-loop or ear-loop by clean woven material with high elasticity. It feels soft and comfortable against the face and will not cause harm to user. It widely applied in industrial cleanroom and production environment which demands high cleanness